// constructors
public GridFSSeekableDownloadStream(
GridFSBucket bucket,
IReadBinding binding,
GridFSFileInfo fileInfo)
: base(bucket, binding, fileInfo)
{
}
// constructors
protected GridFSDownloadStreamBase(
GridFSBucket bucket,
IReadBinding binding,
GridFSFileInfo fileInfo)
{
_bucket = bucket;
_binding = binding;
_fileInfo = fileInfo;
}
private void DownloadToStreamHelper(IReadBindingHandle binding, GridFSFileInfo <TFileId> fileInfo, Stream destination, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
using (var source = new GridFSForwardOnlyDownloadStream <TFileId>(this, binding.Fork(), fileInfo, checkMD5))
{
var count = source.Length;
var buffer = new byte[fileInfo.ChunkSizeBytes];
while (count > 0)
{
var partialCount = (int)Math.Min(buffer.Length, count);
source.ReadBytes(buffer, 0, partialCount, cancellationToken);
//((Stream)source).ReadBytes(buffer, 0, partialCount, cancellationToken);
destination.Write(buffer, 0, partialCount);
count -= partialCount;
}
}
}
// constructors
public GridFSForwardOnlyDownloadStream(
GridFSBucket bucket,
IReadBinding binding,
GridFSFileInfo fileInfo,
bool checkMD5)
: base(bucket, binding, fileInfo)
{
_checkMD5 = checkMD5;
if (_checkMD5)
{
_md5 = MD5.Create();
}
_lastChunkNumber = (int)((fileInfo.Length - 1) / fileInfo.ChunkSizeBytes);
_lastChunkSize = (int)(fileInfo.Length % fileInfo.ChunkSizeBytes);
if (_lastChunkSize == 0)
{
_lastChunkSize = fileInfo.ChunkSizeBytes;
}
}
// constructors
public GridFSForwardOnlyDownloadStream(
GridFSBucket bucket,
IReadBinding binding,
GridFSFileInfo fileInfo,
bool checkMD5)
: base(bucket, binding, fileInfo)
{
_checkMD5 = checkMD5;
if (_checkMD5)
{
_md5 = MD5.Create();
}
_lastChunkNumber = (int)((fileInfo.Length - 1) / fileInfo.ChunkSizeBytes);
_lastChunkSize = (int)(fileInfo.Length % fileInfo.ChunkSizeBytes);
if (_lastChunkSize == 0)
{
_lastChunkSize = fileInfo.ChunkSizeBytes;
}
}
private async Task DownloadToStreamHelperAsync(IReadBindingHandle binding, GridFSFileInfo <TFileId> fileInfo, Stream destination, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
using (var source = new GridFSForwardOnlyDownloadStream <TFileId>(this, binding.Fork(), fileInfo, checkMD5))
{
var count = source.Length;
var buffer = new byte[fileInfo.ChunkSizeBytes];
while (count > 0)
{
var partialCount = (int)Math.Min(buffer.Length, count);
await source.ReadBytesAsync(buffer, 0, partialCount, cancellationToken).ConfigureAwait(false);
await destination.WriteAsync(buffer, 0, partialCount, cancellationToken).ConfigureAwait(false);
count -= partialCount;
}
await source.CloseAsync(cancellationToken).ConfigureAwait(false);
}
}
private async Task DownloadToStreamHelperAsync(IReadBindingHandle binding, GridFSFileInfo fileInfo, Stream destination, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
using (var source = new GridFSForwardOnlyDownloadStream(this, binding.Fork(), fileInfo, checkMD5))
{
var count = source.Length;
var buffer = new byte[fileInfo.ChunkSizeBytes];
while (count > 0)
{
var partialCount = (int)Math.Min(buffer.Length, count);
await source.ReadBytesAsync(buffer, 0, partialCount, cancellationToken).ConfigureAwait(false);
await destination.WriteAsync(buffer, 0, partialCount, cancellationToken).ConfigureAwait(false);
count -= partialCount;
}
await source.CloseAsync(cancellationToken).ConfigureAwait(false);
}
}
private async Task<byte[]> DownloadAsBytesHelperAsync(IReadBindingHandle binding, GridFSFileInfo fileInfo, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
if (fileInfo.Length > int.MaxValue)
{
throw new NotSupportedException("GridFS stored file is too large to be returned as a byte array.");
}
using (var destination = new MemoryStream((int)fileInfo.Length))
{
await DownloadToStreamHelperAsync(binding, fileInfo, destination, options, cancellationToken).ConfigureAwait(false);
return destination.GetBuffer();
}
}
private GridFSDownloadStream CreateDownloadStream(IReadBindingHandle binding, GridFSFileInfo fileInfo, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
var seekable = options.Seekable ?? false;
if (checkMD5 && seekable)
{
throw new ArgumentException("CheckMD5 can only be used when Seekable is false.");
}
if (seekable)
{
return new GridFSSeekableDownloadStream(this, binding, fileInfo);
}
else
{
return new GridFSForwardOnlyDownloadStream(this, binding, fileInfo, checkMD5);
}
}
private async Task <byte[]> DownloadAsBytesHelperAsync(IReadBindingHandle binding, GridFSFileInfo <TFileId> fileInfo, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
if (fileInfo.Length > int.MaxValue)
{
throw new NotSupportedException("GridFS stored file is too large to be returned as a byte array.");
}
var bytes = new byte[(int)fileInfo.Length];
using (var destination = new MemoryStream(bytes))
{
await DownloadToStreamHelperAsync(binding, fileInfo, destination, options, cancellationToken).ConfigureAwait(false);
return(bytes);
}
}
private GridFSDownloadStream <TFileId> CreateDownloadStream(IReadBindingHandle binding, GridFSFileInfo <TFileId> fileInfo, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
var seekable = options.Seekable ?? false;
if (checkMD5 && seekable)
{
throw new ArgumentException("CheckMD5 can only be used when Seekable is false.");
}
if (seekable)
{
return(new GridFSSeekableDownloadStream <TFileId>(this, binding, fileInfo));
}
else
{
return(new GridFSForwardOnlyDownloadStream <TFileId>(this, binding, fileInfo, checkMD5));
}
}
private void DownloadToStreamHelper(IReadBindingHandle binding, GridFSFileInfo fileInfo, Stream destination, GridFSDownloadOptions options, CancellationToken cancellationToken = default(CancellationToken))
{
var checkMD5 = options.CheckMD5 ?? false;
using (var source = new GridFSForwardOnlyDownloadStream(this, binding.Fork(), fileInfo, checkMD5))
{
var count = source.Length;
var buffer = new byte[fileInfo.ChunkSizeBytes];
while (count > 0)
{
var partialCount = (int)Math.Min(buffer.Length, count);
source.ReadBytes(buffer, 0, partialCount, cancellationToken);
//((Stream)source).ReadBytes(buffer, 0, partialCount, cancellationToken);
destination.Write(buffer, 0, partialCount);
count -= partialCount;
}
}
}
